WO2008155117A1

WO2008155117A1 - Valve, particularly glue valve

Info

Publication number: WO2008155117A1
Application number: PCT/EP2008/004933
Authority: WO
Inventors: Reinhard Hoppe; Ralf Barkmann; Stefan Harms; Christian SCHÖNHERR
Original assignee: Focke & Co. (Gmbh & Co. Kg)
Priority date: 2007-06-21
Filing date: 2008-06-19
Publication date: 2008-12-24
Also published as: CN101631979A; US20100133453A1; EP2158423B1; EP2158423B2; PL2158423T5; JP5490686B2; US9080686B2; RU2010101637A; EP2158423A1; RU2460925C2; JP2010531415A; BRPI0810913A2; PL2158423T3; DE102007029064A1; CN101631979B

Abstract

The invention relates to a valve particularly for transferring small portions of glue onto folding tabs of (cigarette) packs. A closing element (15) of the valve is actuated by different elements, that is to say, is moved between the open and closed positions, on the one hand by two permanent magnets (24, 25) arranged a short distance from each other and having aligned poles such that the closing element is permanently kept in the closed position by the permanent magnets (24, 25). On the other hand, an actuating element, which is configured as an electromagnet (23), acts to move the closing element (15) into the open position in a controlled way by overcoming the closing forces. The closing element (15) is designed in a particular way, that is to say, with channels extending along the outside in the longitudinal direction for the medium or the glue.

Description

Valve, in particular glue valve

description

The invention relates to a valve for flowable media, in particular glue nozzle or glue valve, with a valve housing, a discharge or valve opening and a movable within the valve housing closure member which with an end-side closing piece with the valve closed or with a closed nozzle to a valve seat or Düsensitz sealing system receives, wherein the closure member within the valve housing by an actuating means, in particular by an electromagnet, in the open position and by permanent magnets in the closed position is movable and acting in the closed position of the closure member magnetic force or magnetic field strength is weaker than acting on the closure member opening force of the actuating means.

Glue nozzles or glue valves are aimed at the output of small glue portions at a very high number of cycles. In a known glue nozzle, an elongate closure element with a conical closing piece in the valve housing can be moved into the closed position by an electromagnet in the open position and by a helical spring (EP 0 719 592 A2). Trained as a preloaded spring closing member is unsatisfactory with long operating time and high number of cycles of opening and closing movements.

The invention has for its object to propose a valve or a nozzle, in particular for the transmission of glue portions that is designed for a long service life at high cycle rates and beyond very small (glue) portions able to deliver.

To solve this problem, the valve according to the invention is characterized by the following features: a) a first permanent magnet is disposed within the valve housing on a fixed support and a second permanent magnet is opposite and arranged with rectified magnetic pole on the closure member, b) are formed with slightly smaller transverse dimensions of permanent magnets embedded in the carrier on the one hand and in the closing organ on the other hand, Art that rectified magnetic poles of the two permanent magnets are facing each other.

The valve according to the invention is thus designed so that a movement stroke of the closure member is performed by the interaction of two permanent magnets, in particular a closing movement. To open counteracts a suitable actuator, in particular an electromagnet.

Another special feature is that the closure member receives in the open position system on a fixed stop member of the valve or the valve housing, to ensure the protection of the facing permanent magnet spacers a small distance of the organs or permanent magnets from each other.

In a special way, the closure member is formed. An elongate closure body, in particular in a substantially cylindrical design, has depressions, channels or the like extending in the longitudinal direction on the circumference, which allow the flow of the medium, in particular the glue along the lateral surface of the closure body. Protrusions or ribs of the closure body serve to rest against a particular cylindrical inner surface of the valve housing. The spacers are preferably also arranged on the closure body.

Another special feature is the design of the valve seat. This consists of a detachably inserted into the housing socket, in particular of metal or stainless steel and a nozzle body used in this version of particularly wear-resistant material, especially ceramic. This nozzle insert is preferably connected by gluing to the socket.

Further features and special features of the valve according to the invention are explained in more detail below with reference to the description of exemplary embodiments. It shows:

1 a (glue) valve in vertical section,

2 shows a detail II of the valve according to FIG. 1 on an enlarged scale, FIG.

3 shows the valve according to FIG. 1 in a view according to arrow III, on an enlarged scale,

4 a detail of the valve in horizontal section, also enlarged, Fig. 5 is a view similar to FIG. 4 of the embodiment of FIG. 2 in the

Section plane VV ₁

6 shows a representation of the valve analogous to FIG. 1 with additional organs, FIG. 7 shows the exemplary embodiment according to FIG. 6 in a sectional plane or plan view VII-VII according to FIG. 6, FIG.

Fig. 8 is a detail of the valve in a perspective view, namely a

Nozzle insert,

Fig. 9 shows the detail of FIG. 8 in another view, also in perspective, Fig. 10 is a closure member as a detail of the valve, in perspective.

The exemplary embodiments shown relate to a valve or a nozzle for flowing media. In the foreground is the use as a glue valve in packaging technology for the transmission of small glue portions or of glue spots on carrier material, in particular on flaps of cigarette packs.

The glue valve consists of a valve housing 11 to which the medium, ie glue, can be supplied via a glue line 12. The glue portions emerge from a (lower) valve opening 13 or nozzle opening, which is delimited by a conical or conical valve seat 14. A movable closing element 15 cooperates with the latter, which is provided with a closing body or a spherical closing piece 16 facing the valve seat 14 or the valve opening 13. When the valve opening 13 is closed, this receives a sealing engagement with the conical valve seat 14. The closing piece 16 is connected via an intermediate piece 17 to a piston piece 18 as part of the closure member 15. The piston piece 18 and thus the closure member 15 as a whole is within the valve housing 11 in the direction of the valve seat 14 and zurückbewegbar. Above the valve seat 14, a valve chamber 19 is formed, into which the glue line 12 opens and from which glue exits via the valve opening 13 when the valve is open.

The valve housing 11 is provided with a continuous, on the side opposite the valve opening 13 opposite side open in cross-section interior 20. This is closed by a closure piece 21 which is adjustably arranged in a fixed position within the valve housing 11. The closure piece 21 also serves as a stop for the back and forth (off and on) movable closure member 15th The closure member 15 is movable by a closing member in the closed position and by an actuator in the open position. The closing member is preferably constantly effective, so that the closed position of the valve or the closing piece 16 is the normal position. The return member for moving the closure member 15 in the open position is an electromagnet 23 which surrounds the closure member 15 at least in a partial region. The metallic piston piece 18 of magnetizable metal acts within a coil of the electromagnet 23 as its core. When power is therefore transferred to the piston piece 18, a magnetic force and thereby moves the closure member 15 in total in the open position.

The closure member 15 is preferably permanently urged in the closing direction by a closing means. This is designed as a permanent magnet which exerts a permanent magnetic force on the closure member 15 in the sense of a closing movement. The permanent magnet consists of two individual magnets 24, 25, one of which is fixedly mounted on the valve housing 11 and the other on the closure member 15. In the present case, a single magnet 24 is attached to the end portion of the closure piece 21, in the region of an end surface facing the piston piece 18. The electromagnet 24 is seated in a recess or depression in the end region of the closure piece 21, namely set back slightly relative to the end or end face of the closure piece 21. The individual magnet 24 is thereby protected (FIG. 2).

The other individual magnet 25 is mounted in an analogous manner at the (upper) end of the closure member 15 and the piston piece 18 and embedded in a corresponding recess. The individual magnets 24, 25 therefore have a (small) distance from one another even when the glue valve is open. The lifting movements of the closure member 15 are in a limited range of 0.2 mm to 0.8 mm, in particular in a range of 0.2 mm to 0.5 mm. An optimal stroke size is 0.3 mm.

The adjacent permanent magnets 24, 25 are positioned so that like poles face each other, for example the north poles (Figure 2). As a result of the permanent individual magnets 24, 25, a repulsive force is permanently transmitted to the closure member 15, so that it is acted upon in the closed position. The opening movement by the electromagnet 23 overcomes this permanent closing force. The electromagnet 23 or its winding is arranged in an insert 28, which forms a U-shaped, running around recess in vertical or axial section for the winding of the electromagnet 23. The insert forms a cylindrical part of the valve chamber 19. The electromagnet 23rd extends in a region such that the two individual magnets 24, 25 and a portion of the closure member 15 are included.

The closure member 15 is formed in a special way. The piston piece 18 is adapted to the shape and dimension of the interior or the valve chamber 19 in the region of a cylindrical guide part 34. The closure member 15 is formed so that between this and a (cylindrical) inner surface 35 of the valve housing 11 defined spaces for the passage of medium, in particular glue, are formed. Accordingly, the glue can enter into the region between closure member 15 and valve housing 11 or guide member 34 up to the closure piece 21. For this purpose, channels, grooves or similar flow paths for the medium are formed on the periphery of the closure member 15 in the region of the piston piece. In the preferred embodiment, flow channels 36 are formed around and with even distribution. These extend over the full length of the piston piece 18, ie up to a closure piece 21 facing end surface. Between the several flow channels support or guide members, in particular rib-like projections 37 are formed, which cause a guide or abutment of the closure member 18 on the inner wall of the valve housing 11, so that the closure member 15 is exactly centered within the cylindrical portion of the valve housing 11.

In the embodiment of FIG. 4, the laterally directed rib-like projections 37 are polygonal-shaped with a central support surface. The thus formed or limited flow channels 36 are formed corresponding polygonal on the inside. In the embodiment according to FIG. 5, the flow channels 36 are formed in a trough-like manner in cross-section, so that overall a lenticular cross-section is created between the closure member 15 and the guide member 34.

By spacers it is ensured that the individual magnets 24, 25 always have a distance from each other, even in the open position of the closure member 15. The individual magnets 24, 25 with a smaller diameter than the respective carrier, namely as the closure piece 21 on the one hand and the closure member 15 on the other. The spacers are arranged in a region outside the free surfaces of the individual magnets 24, 25. In the present embodiment, a spacer ring 26 is attached to one of the parts, in this case on the movable closure member 15, which has transversely or radially directed openings 27 or recesses for the passage of the medium. The apertures 27 are bounded by projections which form the spacers distributed around it. The openings 27 are located in the region of the flow channels 36 of the closure member 15th

A special feature is the design of the valve seat 14. The valve seat 14 consists of an insert 28 made of high-strength material, in particular ceramic. In the insert at least one nozzle opening, in the present case a central nozzle opening 13 is provided. On the side facing the closing piece 16, a funnel-shaped depression of the insert 28 leads to the nozzle opening 29.

The insert 28 is connected to a holder, namely a retaining ring 30, in particular made of metal, namely stainless steel. The insert 28 is fixed in the retaining ring 30, in particular by gluing connected thereto. The retaining ring 30 is in turn releasably attached to the valve housing 11, in the present example by means of thread 31. On the free side of the retaining ring 30 recesses, namely blind holes 32 are attached, which is the attachment of a tool for inserting or releasing the retaining ring 30 in the To allow trained with mating thread valve housing 11.

Cooling of the valve housing 11 is another special feature of the valve of any design. According to FIGS. 6, 7, an automatically acting cooling system is installed, namely by attaching cooling tubes, so-called heat pipes 38 on the valve housing 11 or in the valve housing 11 The heat pipes 38 are embedded in the valve housing 11 outside the region of the electromagnet 23 or outside the winding thereof. In a square in cross section valve housing 1 1 (Fig. 7) four heat pipes 38 are arranged at the corners of the valve housing 11. The heat pipes 38 extend at least over the full height of the windings of the electromagnet 23. An upper pipe piece 39 projects out of the valve housing 11. In this part, each heat pipe 38 is provided with transverse fins 40 for dissipating the heat to the environment. The heatpipes 38 automatically cause a dissipation of heat by flow to the free, open, upper end.

In a special way, the closure piece 21 (adjustable) is positioned in the valve housing 11. The closure piece 21 is arranged as a cylindrical piece fitting in the cylindrical part of the valve chamber 19. At the closure piece 21, an actuator is mounted for adjusting the position of the closure piece 21. It is an adjusting screw 41. This is connected to a free end portion of the closure piece 21, namely enters with a free end in an axial recess 42 a. In this, the end of the screw 41 is anchored, in particular by a (metal) adhesive. On the threaded adjusting screw 41 an adjusting nut 43 is arranged, which sits with internal thread on the adjusting screw 41 and is anchored with external thread in a head 44 of the valve housing 11. The head 44 is also threadedly connected to the valve housing 11. By turning the adjusting screw 41, this is changed in height with a corresponding displacement of the closure piece 21.

LIST OF REFERENCE NUMBERS

11 valve housing 42 recess

12 glue line 43 adjusting nut

13 valve opening 44 head

14 valve seat

15 closure member

16 striker

17 intermediate piece

18 piston piece

19 Valve chamber 0 Interior 1 Locking piece 2 Seal 3 Electromagnet 4 Single magnet 5 Single magnet 6 Spacer 7 Breakthrough 8 Insert 0 Retaining ring 1 Thread 2 Blind hole 4 Guide element 5 Inner surface 6 Flow channel 7 Projection 8 Heat pipe 9 Pipe section 0 Slats 1 Adjusting screw

Claims

claims

1. Valve for flowable media, in particular glue nozzle or glue valve, with a valve housing (11), an outlet or valve opening (13) and within the valve housing (11) movable closure member (15) which with an end-side closing piece (16 ), the closure member (15) within the valve housing (11) by an actuating means, in particular by an electromagnet (23), in the open position and By permanent magnets in the closed position is movable and in the closed position of the closure member (15) acting magnetic force or magnetic field strength is weaker than on the closure member (15) ekende opening force of the actuating means, characterized by the following features: a) a first permanent magnet (24 ) is within the valve housing (11) on a fixed carrier and a second permanent magnet (25) is arranged opposite and with rectified magnetic pole on the closure member (15), b) formed with slightly smaller transverse dimensions permanent magnet (24, 25) are embedded in the carrier on the one hand and in the closure member (15) on the other hand, such that rectified magnetic poles of the two permanent magnets facing each other.

2. Valve according to claim 1, characterized in that the permanent magnets (24, 25) with the valve open, ie at a retracted from the valve seat (14) position of the closure member (15) are fixed in (small) distance from each other, in particular by spacers (26) on an end surface of the closure member (15) and / or on the carrier of the fixed permanent magnet (24).

3. Valve according to claim 1 or 2, characterized in that the spacer consists of an outside of the region of the permanent magnet (25) arranged (annular) spacer (26) which by interruptions, in particular by radially directed openings (27) in individual, along the circumference of the closure member (15) distributed spacers, wherein the openings (27) serve to flow through the flowable medium.

4. Apparatus according to claim 1 or one of the further claims, characterized in that the mutually adjacently arranged individual magnets (24, 25) in the mutually facing end position, in particular according to the open position of the closure member (15), by spacers or spacers outside the range the individual magnets (24, 25) have a defined distance from one another, preferably by an annular spacer (26) arranged at the end of the closure member (15) with transverse apertures (27) for the passage of medium.

5. Valve according to claim 1 or one of the further claims, characterized in that the elongated, approximately cylindrical closure member on the outer ßenumfang longitudinally extending recesses, channels (36), grooves or the like with web or rib-like projections (37) in The longitudinal direction of the closure member (15) in each case between a plurality of circumferentially distributed channels (36), grooves, depressions or the like, wherein the projections (37) for supporting the closure member (15) on a preferably cylindrical inner surface (35) of the valve housing (11) ,

6. Valve according to claim 1 or one of the further claims, characterized in that in the valve housing (11), namely in a preferably approximately cylindrical interior (20) of the housing (11) an interior space (20) filling supporting member, in particular a closure piece (21) is arranged as a carrier of the fixed permanent magnet (24) in the lower end region, wherein the closure piece (21) preferably serves as a stop for the closure member (15) in the open position.

7. Valve according to claim 6 or one of the further claims, characterized in that the closure piece (21) is adjustably held in the valve housing (11), in particular by an out of the valve housing (11) exiting set screw (41) with the closure piece ( 21) is connected, preferably by entering a free end of the adjusting screw (41) in an axial recess (42) of the closure piece (21) and connection to each other by means of press fit and / or adhesion.

8. Valve according to claim 1 or one of the further claims, characterized by the arrangement of cooling means within the valve housing (11), in particular adjacent to the electromagnet (23) or to the winding, wherein the coolant is preferably designed as upright heatpipes (38) and in the valve housing (11) are arranged such that a preferably upwardly directed outlet opening is exposed.

9. Valve according to claim 8 or one of the further claims, characterized in that in a valve housing (11) having a substantially rectangular or square cross section in particular four heat pipes (38) are each arranged in the region of corners of the valve housing (11).

10. Valve according to claim 8 or one of the further claims, characterized in that the tubular heatpipes (38) protrude with an extension, namely a free pipe section (39) on an upper side of the valve housing (11), wherein in the region of the pipe section ( 39) transverse blades (40) are mounted to dissipate the heat.